All-Solid-State Battery Stack Drying for Moisture-Sensitive Electrolytes

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Solution Overview

Problem

Sulfide-based solid electrolytes in all-solid-state batteries are sensitive to moisture and oxygen, leading to stability issues and degradation of performance.

Innovation Solution

A manufacturing method involving vacuum-drying of the unit-cell stack at controlled temperatures and times, followed by pressing and secondary vacuum-drying, to manage moisture content and enhance electrochemical properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If sulfide-based solid electrolyte is used in all-solid-state battery, then energy density and charging/discharging rate are improved, but sensitivity to moisture and oxygen increases

Engineering Contradiction:

Improveenergy densityVSAvoidsensitivity to moisture and oxygen

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent applies inert atmosphere by conducting vacuum-drying processes in environments with controlled oxygen and moisture levels. The manufacturing process uses vacuum conditions to remove harmful substances while preventing re-exposure, creating an inert environment that protects the moisture-sensitive solid electrolyte during critical processing stages.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

The patent implements preliminary action by performing vacuum-drying at specific temperature ranges (50-200°C) for predetermined time periods (30 minutes to 48 hours) before final assembly. This preliminary removal of moisture and oxygen prevents degradation during subsequent handling and operation, addressing the sensitivity issue before it affects battery performance.

Inventive Principle:

Principle #10Preliminary action

2Quantity of substance

If vacuum-drying is performed at higher temperature for longer time, then moisture content is reduced, but risk of damaging battery components increases

Engineering Contradiction:

Improvemoisture contentVSAvoidcomponent integrity

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent applies parameter changes by optimizing the vacuum-drying conditions within specific ranges: temperature between 50-200°C and time between 30 minutes to 48 hours. These controlled parameter changes achieve effective moisture removal while preventing thermal damage to the solid electrolyte and other battery components, resolving the contradiction between drying efficiency and component safety.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The method effectively reduces moisture content, improving the capacity, lifespan, and resistance characteristics of the all-solid-state battery.

Implementation Method 1

vacuum-drying the unit-cell stack

Methodology Applied

Scientific EffectVacuum-drying: Vacuum Distillation

Implementation Method 2

vacuum-drying the unit-cell stack at a temperature ranging from 50° C. to 200° C.

Methodology Applied

Scientific EffectEvaporation: Evaporation

Implementation Method 3

pressing the vacuum-dried unit-cell stack

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 4

pressing the vacuum-dried unit-cell stack through a Warm Isostatic Pressing (WIP) manner

Methodology Applied

Scientific EffectThermal energy: Heating

Data Source

PatentUS20260011789A1Method and system for manufacturing all-solid-state battery

Publication Date: 2026.01.08 HYUNDAI MOTOR CO LTD

AI summary

A method and a system for manufacturing an all-solid-state battery may be capable of controlling change in performance, as the all-solid-state battery is exposed to moisture and oxygen.